A5060188914- Geophysics and Gravity Measurements
- GNSS positioning and interference
- Geophysics and Sensor Technology
- Advanced Frequency and Time Standards
- Ionosphere and magnetosphere dynamics
- Radio Astronomy Observations and Technology
- Inertial Sensor and Navigation
- Advanced Fiber Laser Technologies
- Astronomical Observations and Instrumentation
- Advanced Fiber Optic Sensors
- Seismic Waves and Analysis
- Advanced Measurement and Metrology Techniques
- Scientific Measurement and Uncertainty Evaluation
- Astrophysics and Cosmic Phenomena
- Seismology and Earthquake Studies
- Reservoir Engineering and Simulation Methods
- Cryospheric studies and observations
- Computational Physics and Python Applications
- Geomagnetism and Paleomagnetism Studies
- Historical Geography and Cartography
- Methane Hydrates and Related Phenomena
- Particle Accelerators and Free-Electron Lasers
- Pulsars and Gravitational Waves Research
- Geodetic Measurements and Engineering Structures
- Geothermal Energy Systems and Applications
Federal Agency for Cartography and Geodesy
2012-2023
GFZ Helmholtz Centre for Geosciences
2008
Technical University of Munich
2003
We demonstrate a $16\text{ }\text{ }{\mathrm{m}}^{2}$ helium-neon ring laser gyroscope with sufficient sensitivity and stability to directly detect the Chandler wobble of rotating Earth. The successful detection both annual is verified by comparing time series measurements against ``C04 series'' Earth rotation data from International Rotation Reference System Service.
We report the first direct measurements of very small effect forced diurnal polar motion, successfully observed on three our large ring lasers, which now measure instantaneous direction Earth's rotation axis to a precision 1 part in 10 8 when averaged over time interval several hours. Ring laser gyroscopes provide new viable technique for directly and continuously measuring position Earth amplitudes Oppolzer modes. In contrast, space geodetic techniques (very long baseline interferometry,...
Superconducting gravimeters (SG) measure temporal changes of the Earth’s gravity field with high accuracy and long-term stability. Variations in local water storage components (snow, soil moisture, groundwater, surface water, stored by vegetation) can have a significant influence on SG measurements — from geodetic perspective add noise to records. At same time, this hydrological signal provide substantial information about quantification balances. A 4D forward model spatially nested...
An Earth tide signal at the lunar tidal period of 12 hours 25 min has been detected in Sagnac frequency record C‐II ring laser 30 m underground Christchurch, New Zealand. Its amplitude, one part per million rotation signal, is much greater than value 40 parts billion expected. Tiltmeter records show that a substantial this amplification geophysical, component tilt having an amplitude order 0.1–0.2 μrad, principally because ocean loading Banks Peninsula. The joint also effects on associated...
Abstract We provide a survey on the joint European research project “GeoMetre”, which explores novel technologies and their inclusion to existing surveying strategies improve traceability of geodetic reference frames SI definition metre. This work includes development distance meters with range up 5 km, realisation optical multilateration systems for large structure monitoring at an operation 50 m beyond, strategy GNSS-based determination. Different methods refractivity compensation, based...
SUMMARY In modelling atmospheric loading effects for terrestrial gravimetry, state-of-the-art approaches take advantage of numerical weather models to account the global 3-D distribution air masses. Deformation are often computed assuming Inverse Barometer (IB) hypothesis be generally valid over oceans. By a revision IB assumption and its consequences we show that although seafloor is not deformed by pressure changes, there exists fraction ocean mass current schemes usually accounting for....
The Gross Ring G is a square ring laser gyroscope, built as monolithic Zerodur structure with 4 m length on all sides. It has demonstrated that large provides sensitivity high enough to measure the rotational rate of Earth precision ΔΩE < 10-8. possible show further improvement in accuracy could allow observation metric frame dragging, produced by rotating mass (Lense-Thirring effect), predicted General Relativity. Furthermore, it can provide local measurement near provided international...
A measurement campaign was carried out at the Geodetic Observatory Wettzell in order to determine reference point of a radio telescope used for Very Long Baseline Interferometry (VLBI) better than 1 mm. This has been determined by measuring trajectories targets installed on telescope, using two commercial total stations, but also prototype multilateration system composed one absolute distance meter and four heads. The use prototypes is always subject risk, so produced data must be carefully...
A global geodetic reference system (GGRS) is realized by physical points on the Earth’s surface and referred to as a frame (GGRF). The GGRF derived combining several space techniques, of these techniques are such realization. Due weak connection between so-called local ties introduced combination procedure. tie spatial vector defined two techniques. It derivable measurements at multitechnique stations, which operate more than one technique. Local crucial component within intertechnique...
ABSTRACT The German Antarctic Receiving Station (GARS) O’Higgins at the northern tip of Peninsula is a dual purpose facility for earth observation and has existed more than 20 years. It serves as satellite ground station payload data downlink telecommanding remote sensing satellites well geodetic observatory global reference systems change. Both applications use same 9 m diameter radio antenna. Major outcomes this usage are summarised in paper. (OHG) part network Remote Sensing Data Centre...
Abstract. The VLBI (Very Long Baseline Interferometry) technique can provide the full set of parameters needed for transformation between celestial and terrestrial reference frames with high accuracy. Yet it has some limitations regarding temporal resolution continuity, accuracy resulting Earth Orientation Parameters (EOP) varies depending on network geometry. In this work we explore benefit combining observations measurements large ring laser gyroscope “G” in Wettzell deriving highly...